I saw the following tasty morsel on source-changes@ tonight, & knowing there are a few here who have installed OpenBSD's evolving replacement to sendmail(8), they may be intrigued by the following announcement by Gilles on its current state:

From what I have read off google(ing) OpenSMTPD, sound great. Sendmail has alwasy been such a pain to configure for newbies. It's rock solid, but not very simple and easy to get started with. OpenSMTPD looks to be a promising alternative.